References of "EL SHAZLY, Amr"
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See detailNovel association between vasoactive intestinal peptide and CRTH2 receptor in recruiting eosinophils: a possible biochemical mechanism for allergic eosinophilic inflammation of the airways.
EL SHAZLY, Amr ULg; Begon, Dominique ULg; KUSTERMANS, Gaëlle ULg et al

in Journal of Biological Chemistry (2013), 288(2), 1374-84

We explored the relation between vasoactive intestinal peptide (VIP), CRTH2, and eosinophil recruitment. It is shown that CRTH2 expression by eosinophils from allergic rhinitis (AR) patients and ... [more ▼]

We explored the relation between vasoactive intestinal peptide (VIP), CRTH2, and eosinophil recruitment. It is shown that CRTH2 expression by eosinophils from allergic rhinitis (AR) patients and eosinophils cell line (Eol-1 cells) was up-regulated by VIP treatment. This was functional and resulted into exaggerated migratory response of cells against PGD2. Nasal challenge of AR patients resulted into significant increase of VIP contents in nasal secretion (ELISA), and the immunohistochemical studies of allergic nasal tissues, showed significant expression of VIP in association with intense eosinophil recruitment. Biochemical assays showed that VIP-induced eosinophils chemotaxis from AR patients and Eol-1 cells, was mediated through CRTH2 receptor. Cells migration against VIP was sensitive to protein kinase C (PKC) and protein kinase A (PKA) inhibition, but not to tyrosine kinase or P38 MAP-kinase inhibition, or calcium chelation. Western blot demonstrated a novel CRTH2 mediated cytosol to membrane translocation of PKC-epsilon, PKC-delta and PKA-alpha, gamma and IIalpha reg in Eol-1 cells upon stimulation with VIP. Confocal images and FACS demonstrated a strong association and co-localization between VIP peptide and CRTH2 molecules. Further, VIP induced PGD2 secretion from eosinophils. Our results demonstrate the first evidence of association between VIP and CRTH2 in recruiting eosinophils. [less ▲]

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See detailNovel cooperation between CX3CL1 and CCL26 inducing NK cell chemotaxis via CX3CR1: a possible mechanism for NK cell infiltration of the allergic nasal tissue
EL SHAZLY, Amr ULg; Castillo-Doloriert, Hugo; Bisig, Bettina et al

Poster (2013)

Background: Recent data indicated that natural killer (NK) cells and chemokines could play a pivotal role in nasal inflammation. CX3CR1, the only receptor for fractalkine/ CX3CL1, is abundantly expressed ... [more ▼]

Background: Recent data indicated that natural killer (NK) cells and chemokines could play a pivotal role in nasal inflammation. CX3CR1, the only receptor for fractalkine/ CX3CL1, is abundantly expressed by NK cells, and was recently shown to also be a receptor for eotaxin-3/CCL26. However, no reports explored the NK cells-CX3CL1-CCL26 axis via CX3CR1 in allergy.
Objective: Our goals were first to determine specifically NK cell recruitment pattern in nasal tissue of allergic chronic rhinosinusitis (ACRS) and non-allergic chronic rhinosinusitis (NACRS) patients in comparison with healthy controls, and secondly, to investigate the function of CX3CR1 in NK cell migration. Methods: Immunohistochemistry, microchemotaxis chambers, flow cytometry and confocal microscopy were used in this study. Results: Herein, we showed that NK cells infiltrated the epithelial layers of nasal tissue only in ACRS patients and not in NACRS patients or controls. NK cells were also more numerous in the stroma of the nasal tissue from ACRS patients compared with NACRS patients or controls. This migration could be mediated by both CX3CL1 and CCL26, as these two chemokines induced NK cell migration. Moreover, both molecules also stimulated cytoskeleton changes and F-actin reorganisation in NK cells. Chemotaxis and cytoskeleton changes were sensitive to genistein, a tyrosine kinase inhibitor. By flow cytometry, we demonstrated that a single antigen nasal provocation challenge increased the expression of CX3CR1 on NK cells in allergic rhinitis (AR) patients. The function of this receptor was associated with a significant augmentation of NK cell chemotaxis against the optimal doses of CX3CL1 and CCL26. Conclusions and Clinical Relevance: Our results highlight a novel role for CX3CR1 in NK cell migration that may contribute to the NK cell trafficking to the allergic upper airway. This could be mediated largely by CX3CL1 and CCL26 stimulation of the tyrosine kinase pathway. [less ▲]

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See detailNovel cooperation between CX3CL1 and CCL26 inducing NK cell chemotaxis via CX3CR1: a possible mechanism for NK cell infiltration of the allergic nasal tissue.
EL SHAZLY, Amr ULg; Castillo- Doloriert, Hugo; Bisig, Bettina et al

in Clinical & Experimental Allergy : Journal of the British Society for Allergy & Clinical Immunology (2013), 43(3), 322-31

BACKGROUND: Recent data indicated that natural killer (NK) cells and chemokines could play a pivotal role in nasal inflammation. CX3CR1, the only receptor for fractalkine/CX3CL1, is abundantly expressed ... [more ▼]

BACKGROUND: Recent data indicated that natural killer (NK) cells and chemokines could play a pivotal role in nasal inflammation. CX3CR1, the only receptor for fractalkine/CX3CL1, is abundantly expressed by NK cells, and was recently shown to also be a receptor for eotaxin-3/CCL26. However, no reports explored the NK cells-CX3CL1-CCL26 axis via CX3CR1 in allergy. OBJECTIVE: Our goals were first to determine specifically NK cell recruitment pattern in nasal tissue of allergic chronic rhinosinusitis (ACRS) and non-allergic chronic rhinosinusitis (NACRS) patients in comparison with healthy controls, and secondly, to investigate the function of CX3CR1 in NK cell migration. METHODS: Immunohistochemistry, microchemotaxis chambers, flow cytometry and confocal microscopy were used in this study. RESULTS: Herein, we showed that NK cells infiltrated the epithelial layers of nasal tissue only in ACRS patients and not in NACRS patients or controls. NK cells were also more numerous in the stroma of the nasal tissue from ACRS patients compared with NACRS patients or controls. This migration could be mediated by both CX3CL1 and CCL26, as these two chemokines induced NK cell migration. Moreover, both molecules also stimulated cytoskeleton changes and F-actin reorganisation in NK cells. Chemotaxis and cytoskeleton changes were sensitive to genistein, a tyrosine kinase inhibitor. By flow cytometry, we demonstrated that a single antigen nasal provocation challenge increased the expression of CX3CR1 on NK cells in allergic rhinitis (AR) patients. The function of this receptor was associated with a significant augmentation of NK cell chemotaxis against the optimal doses of CX3CL1 and CCL26. CONCLUSIONS AND CLINICAL RELEVANCE: Our results highlight a novel role for CX3CR1 in NK cell migration that may contribute to the NK cell trafficking to the allergic upper airway. This could be mediated largely by CX3CL1 and CCL26 stimulation of the tyrosine kinase pathway. [less ▲]

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See detailIFN-gamma and TNF-alpha potentiate prostaglandin D2-induced human eosinophil chemotaxis through up-regulation of CRTH2 surface receptor.
EL SHAZLY, Amr ULg; MOONEN, Vincent ULg; MAWET, Marie et al

in International immunopharmacology (2011), 11(11), 1864-70

Prostaglandin D2 (PGD2) receptor CRTH2, is a pro-inflammatory molecule involved in eosinophil recruitment to the allergic airway. We investigated the expression of CRTH2 in eosinophil from allergic ... [more ▼]

Prostaglandin D2 (PGD2) receptor CRTH2, is a pro-inflammatory molecule involved in eosinophil recruitment to the allergic airway. We investigated the expression of CRTH2 in eosinophil from allergic rhinitis patients (AR) and tested the modulatory role of several TH1 and TH2 cytokines closely related to the allergic immunological response, on the expression of CRTH2 receptor, utilizing human eosinophil cell line (Eol-1).The expression of CRTH2 was tested by immunohistochemistry and flow cytometry (FACS). Chemotaxis was performed in micro-chemotaxis chambers. It is shown that the expression of CRTH2 by eosinophils was significantly higher in the nasal tissue and peripheral blood of AR patients, when compared to control subjects. PGD2 exhibited a typical bell shape dose response in attracting eosinophil from AR patients with optimal activity at 10(-7)M. Eol-1 cell surface expression of CRTH2 was significantly up-regulated by 10ng/ml IFN-gamma and TNF-alpha. The percentage of Eol-1 cells expressing the receptor increased by IFN-gamma and TNF-alpha from 12.74%+/-2.66 to 55%+/-8 and 33.8%+/-9.4, respectively. PGD2-induced Eol-1 chemotaxis was not blocked by SB203580, H-89 Dihydrochloride, Bisindo-lylmaleimide, or Genistein. PGD2-induced Eol-1 chemotaxis was potentiated by IFN-gamma and TNF-alpha without changing the signal transduction pathway. Correlation of our results to peripheral blood eosinophils from allergic rhinitis patients confirmed that 3hour pretreatment of eosinophils by 10ng/ml IFN-gamma and TNF-alpha, increased the mean fluorescence intensity (MFI) of CRTH2 from 8.23 to 9.68 and 9.38, respectively, and potentiated PGD2-induced eosinophil chemotaxis. Our results demonstrate a novel synergism between PGD2, IFN-gamma and TNF-alpha, in eosinophil chemotaxis. [less ▲]

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See detailCharacterization of hepatitis C virus-induced nasal mucosa remodelling.
El Shazly, Amr ULg; Arafa, Mohammad; Roncarati, Patrick ULg et al

in Histopathology (2010), 57(3), 488-92

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See detailPertussis in adulthood: report of two cases and review of the literature.
Poirrier, Anne-Lise ULg; Gillard, Noelle ULg; Lefèbvre, Philippe ULg et al

in Laryngoscope (2009), 119(9), 1720-2

Whooping cough is resurgent in the developed world. Systematic vaccination has changed its epidemiology, with the majority of cases now primarily affecting adolescents and adults. A 46-year-old male ... [more ▼]

Whooping cough is resurgent in the developed world. Systematic vaccination has changed its epidemiology, with the majority of cases now primarily affecting adolescents and adults. A 46-year-old male physiotherapist presented with a 1-week history of bothersome cough and respiratory difficulties, and a 51-year-old man was admitted to the emergency department with a 4-week history of increasing cough and dyspnea. Polymerase chain reaction of nasopharyngeal swab were positive for Bordetella pertussis. These cases illustrate pertussis in adulthood. We review the clinical features, the prevalence, the diagnostic tools, and the management of the patients and their relatives to increase awareness of this highly contagious disease. [less ▲]

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